Jackson JSON Processor Home
Inspired by the quality and variety of XML tooling available for the Java platform (StAX, JAXB, etc.), the Jackson is a multi-purpose Java library for processing JSON data format. Jackson aims to be the best possible combination of fast, correct, lightweight, and ergonomic for developers.
Introduction
First things first:
Jackson Tutorial gives you reasonable overview of basic usage
Licensing page outlines what Open Source licenses are used with Jackson (ASL, LGPL)
Jackson FAQ covers various other aspects, including common usage cases.
Testimonials
After introduction, you may want to know who is already using Jackson for production work:
Sampling of current users gives an idea of Jackson adoption
Get it!
And then it may be time to check Jackson out:
Download page has all the artifacts (jars, sources) you need.
Project
Jackson project page at Codehaus has more day-to-day information about development process, and active Open Source developers working on Jackson
More to Learn
And if (when!) this all looks good, there is plenty more to learn:
Jackson Documentation has plenty more to guide you through more advance usage
TODO covers areas that could use contributions from new contributors...
Immediate next steps: work towards version 1.5 ("Types R Us" aka "Jackson Five")
Other
Beyond these first steps, you may want to investigate these resources:
CowTalk Blog has blog entries related to Jackson usage, development.